通过高温高压循环水均匀腐蚀试验及电化学测试方法，研究了800合金传热管在300 ℃、10 MPa、去离子水、溶氧（DO=2 mg/L）以及溶氢（DH=2.7 mg/L）条件下的均匀腐蚀速率及表面氧化膜特征。结果表明，800合金在DO及DH这两种条件下的均匀腐蚀速率均很低，分别为5.6 μm/a和1.2 μm/a。在这两种环境中，试样氧化膜均为内外双层结构，内层连续而致密，外层主要由颗粒状氧化物组成。800合金在正常运行环境（DH工况）中，具有较稳定的电化学特征和明显的钝化区；而在含氧环境中（DO=2 mg/L），随着时间的延长，在96 h后，开路电位会发生明显的升高，开路电位由-0.39 V（vs.SHE）逐渐升高至0.42 V（vs.SHE），呈现出无明显的钝化区，但自腐蚀电流密度未有明显提高，且阻抗值较大，说明合金表面仍具有较稳定的氧化膜结构。

Through high temperature and high pressure circulating water test and electrochemical test, the uniform corrosion rate and surface oxide film characteristics of alloy 800 tube were studied under the conditions of 300 ℃, 10 MPa, deionized water, 2 mg/L DO (dissolved oxygen) and 2.7 mg/L DH (dissolved hydrogen). The results showed that the uniform corrosion rates of alloy 800 under DO and DH conditions were very low, which were 5.6 μm/a and 1.2 μm/a respectively. The oxide films under these two conditions were both composed of two layers. The inner layer of the oxide film was continuous and dense, while the outer layer was mainly composed of granular oxide. In the normal operation environment (DH working condition), alloy 800 presented more stable electrochemical characteristics and obvious passivation zone; while in the oxygen containing environment (DO=2 mg/L), the open circuit potential increased significantly after 96 h, increased from -0.39 V (vs. SHE) to 0.42 V (vs. SHE). No obvious passivation was observed, but the self-corrosion current density was not increased and the impedance value was much higher, indicating that the alloy surface still had relatively stable oxide film structure.